This stereogram is a cropped and 2x magnified version of image 1.
This image shows fossil 1 about 1/3 up from the bottom. Note the distinct shadow that shows that the shape of the object when viewed from overhead is relatively unchanged. The right-hand image exhibits some fairly severe jpeg compression artifacs in the region where the "stem" connects to the "berry". The "berry" is about 3 mm in diameter (about the size of a BB).
Both images were cropped from the much larger originals.
The right-hand image was rotated -6 degrees.
Both images were resized by a factor of 2x.
Original full-size images:
Left Panoramic Camera Non-linearized Full frame EDR acquired on Sol 37 of Opportunity's mission to Meridiani Planum at approximately 13:55:39 Mars local solar time, camera commanded to use Filter 7 (1001 nm).
Right Panoramic Camera Non-linearized Full frame EDR acquired on Sol 37 of Opportunity's mission to Meridiani Planum at approximately 13:47:34 Mars local solar time, camera commanded to use Filter 1 (719 nm).
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